Its a clip that holds the end of your filament - Filament Clip V4 by [%9767215690] Yay first make and printed as part of the https://www.crealitycloud.com/contest/november-3d-printing-event I do love to try new filament clips and this is a great little clip. It might struggle with reels that have a rolled edge but with be fine with most rolls of filament. Nice sturdy clip that should last and prints without supports. Printed on a K1 Max with Hyper Series Blue PLA filament at 190mm/s. Prints great. [%9631304319][%6839402488]